冬季青岛不同气团来源气溶胶中磷浓度及溶解度

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Abstract Aerosol samples in Qingdao were collected from Nov. 2017 to Jan. 2018 to measure the total P (TP), dissolved total P (DTP), dissolved inorganic P (DIP) and dissolved organic P (DOP) contained in aerosols. A large difference of concentration and solubility of airborne particulate P existed between two types of air masses, e.g., fast-moving dry cold air masses from the northern continent sources (NS) and the stagnant warm moist air masses from local sources (LS), and the causes were investigated. The TP concentrations in NS-derived and LS-derived aerosols were (137.3 ±49.3) ng/m³ and (115.8 ±45.8) ng/m³, respectively, and the contributions of DTP to TP (i.e., P solubility) were (20.7±5.6)% and (45.9±15.7)%. DIP was the dominant form in DTP, and its contribution to DTP was 66% in NS aerosols and 55% in LS aerosols. The contributions of anthropogenic P to TP in NS-derived aerosols were 69%, slightly lower than LS-derived aerosols (72%). A combination of higher aerosol acidification degree (the molar ratio of acids/TP), higher ambient relative humidity (RH), and slower air mass transport speed could be used to explain the higher P solubility in LS-derived aerosols. At RH <60%, aerosol P solubility did not exceed 30% even at high levels of acids/TP. At RH >60%, acidic conditions and low aim mass moving speed could facilitate and enhance the conversion of aerosol P from insoluble to soluble. This study suggested that the severe air pollution might have increased the atmospheric input of bioavailable P to the China seas.

Key words： phosphorus (P) solubility aerosol atmospheric acidification relative humidity (RH) air mass source

Received: 13 January 2020

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X513

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	MA Miao
	SHI Jin-hui
	GAO Hui-wang
	YAO Xiao-hong

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MA Miao,SHI Jin-hui,GAO Hui-wang等. Concentration and solubility of airborne particulate phosphorus at Qingdao in winter related to various types of air mass[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(9): 3748-3755.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I9/3748

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